While it contains effective jump scares and a creepy atmosphere, some viewers felt the tactics were becoming stale for the franchise. Movie Overview
The film takes place after the events of Insidious: Chapter 3. Elise Rainier, a skilled paranormal investigator, is haunted by her past experiences in the Further, a realm that exists between the living world and the afterlife. When a young woman named Mel comes to Elise for help, she discovers that Mel's family is being terrorized by a malevolent entity.
For fans of the franchise, The Last Key offers crucial lore expansion. The film introduces new concepts regarding "The Further," the dark astral dimension where the spirits reside. We learn more about the mechanics of spiritual tethering and the dangers of leaving one's body unprotected.